Don't you just love it when your HR goes really really high and your pace is slow. Yesterday, I ran 8 miles at 11 minutes per mile pace and my heart rate was in 170-180 range . I took walking breaks during the last 4 miles, but it did not really help much.

Usually my HR is around 145-150 at this slow pace. Maybe lack of sleep caused it. I only slept 3 hours the night before my long run.
Yesterday and today I feel totally exhausted, Is it normal?

Don't you just love it when your HR goes really really high and your pace is slow. Yesterday, I ran 8 miles at 11 minutes per mile pace and my heart rate was in 170-180 range . I took walking breaks during the last 4 miles, but it did not really help much.

Usually my HR is around 145-150 at this slow pace. Maybe lack of sleep caused it. I only slept 3 hours the night before my long run.
Yesterday and today I feel totally exhausted, Is it normal?

"today I feel totally exhausted, Is it normal? "--No it is not normal. Adjust your schedule.